envoymediagroup/MediaMath-PHP-Library — comment on commit d758cc9d0ce32524c450082ad12ffa895d36afae
File: 1.0/MediaMathAPI/TargetDimensions.php line 12
By masto:

These IDs are not necessarily the same between different environments. It would be better to use the target_dimension's "code" field to select the right one. Or at least check it so you don't end up targeting the wrong dimension.